Engine oil Castrol or OEM BMW
I recommend checking your oil level at 3000 miles because some vehicles burn oil. BMW and Audi especially, at 1500~2000miles I will top off.
Germany, 320d, 2008, 280000km, Castrol Edge 5w-30. Every 15000km
Castrol high mileage 5w-30 every 3 to 5k
Any other oil I have tried made my lifter tick super loud in cold weather
I use Castrol Edge 0W-40 in my '08 328, N52. Based on used oil analysis from Blackstone Labs, I'm at a 6K mile change interval.
The OEM oil filter worked well to keep insolubles low, and after 8,570 miles on this fill of Castrol High Mileage, the 2.8 TBN shows the oil had active additive to spare.
Castrol Europeans 0W40 is my typical go-to but Mobil-1 is great, get whichever is cheaper.
Personally on my half million mile M54 E46 I use Castrol edge high mileage 5W-30 with a ok filter; mobile one or the stp extended life filter as those two typically come with the red o rings which tend to last much longer than the black ones.
BMW has been endorsing Castrol since the early 1990's and I have to say that I've never had anything but good results using Castrol. I think it is a great oil and seems to do really well in BMWs.
Castrol Power 1 isn't a bad oil, but I'd say not the best either. I have only used LiquiMoly as an alternative, so far and I rate is better than the Castrol but it did cost almost 2x as much too.
Oil consumption is a common problem. My original E92 consumed a quart of oil every 1K miles. My current car does not.
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